Border Cave, South Africa (IMAGE) University of Colorado at Boulder Caption New research led by CU-Boulder on South Africa's Border Cave shows the Later Stone Age emerged more than 20,000 years than previously thought. Credit Courtesy Paola Villa, University of Colorado Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.